
Self-controlled robo guard scans for dangerous individuals and suspicious packages, would probably look adorable with a police officer’s uniform.
The morning started off like any other. We got up, hopped on the train to go to SoraNews24 headquarters, and when we got off at Seibu Shinjuku Station, at first nothing looked out of the ordinary.
But the station sounded different. No, it wasn’t filled with the squeals of adoring fangirls swooning over posters of our ace reporter Mr. Sato (those were only up at Seibu Ikebukuro Station). Instead, mixed in with the murmurs and footsteps of our fellow commuters we could hear a clear yet mechanical voice repeatedly saying “Security patrol in progress. Security patrol in progress.”
And then we saw this.
Japan is the cosplay capital of the world, and at first we thought this might be an overzealous costumer who just couldn’t wait until next month’s winter Comiket to show off his outfit. It turns out, though, that that’s an honest-to-goodness security robot patrolling one of Tokyo’s most important rail hubs.
This isn’t a remote-controlled land drone, either. The Perseusbot, as it’s officially called, moves autonomously, thanks to technology jointly developed by Seibu Railway, the Tokyo Metropolitan Industrial Technology Research Institute, and Japanese artificial intelligence firms Earth Eyes and Nihon Unisys. As it patrols its territory, the Perseusbot scans the area with its onboard camera and also analyzes images sent to it by the facility’s preexisting installed security cameras, searching for humans moving aggressively or dangerously as well as suspicious unattended packages.
▼ The Perseusbot has a bit of a paunch, which makes us wonder if it also scans for snacks.
However, while the security robot is capable of detecting problems on its own, it leaves threat response up to flesh-and-blood colleagues. When it spots someone or something dangerous, it sends a notification to the facility’s human security staff, so there’s no need to worry about it shooting death rays or shocking you with a stun baton if you look at it cockeyed.
▼ Seeing it standing guard in front of a Starbucks sign has us wondering if, unlike carbon-based law-enforcement officers in Japan, the Perseusbot is allowed to consume beverages while on duty.
The robot is still undergoing field testing, so that the developers can gauge its capabilities and also the effect it has on pedestrian traffic flow. Since its systems aren’t completely finalized yet, when we came across the Perseusbot it was being followed by a group of researchers.
▼ Making it look like it’s got its own celebrity entourage
The Seibu Shinjuku Station test run ended on November 30, but given the rail operator’s involvement in the project, it’s probably only a matter of time until we run into one again. Hopefully it’ll be more understanding of our writers’ periodically bizarre appearance than the human Tokyo cops.
Reference: Seibu Railway, Asahi Shimbun
Photos ©SoraNews24
[ Read in Japanese ]
Follow Casey on Twitter, where, on second thought, he thinks it would be best to dress the Perseusbot is a penguin costume.








Robot security guards patrol Tokyo Metropolitan Government Building
Japan Railways wants to build a team of robots to help travelers, catch criminals in its stations
This handsome anime-style security guard will be protecting actual homes and offices in Japan
Skynet sends a Terminator to Tokyo’s Shinjuku Station to future-freak-out commuters【Photos】
Robot noodle chef starts working in Tokyo train station, serves up taste of the future【Video】
Uniqlo reveals third round of massive 100-year-anniversary manga T-shirts for Jump’s Shueisha
Starbucks Japan unveils new Frappuccino showcasing “mottainai” culture
New official Ghibli anime food cookbook will teach you how to make Ponyo’s ramen and more
What’s it like to join Tokyo’s walking-and-talking-with-strangers club for a day?
Osaka is hosting a “hentai” event, but it’s probably not what you think
Starbucks Japan has a mesh bag so cute it’s a sell-out hit
Art exhibition coming to Tokyo this month brings the cute, scary, and weird to ukiyo-e
Extra-cute Sea Animal crepes come to Japan’s cafe chain born from a sweet fashion brand
New littering fine now being enforced in some of Tokyo’s most heavily touristed areas
And now, a crazy-looking way to stay cool this summer, from Japan’s crazy gadget company
Japanese convenience store Lawson launches new “mini supermarket” chain, L Minimart
Japan’s real-world Pokémon hot spring’s first photos are here![Photos]
What’s up with the Ghibli Park photo and video ban?
Japan’s adorable pudding chick becomes a transit card mascot
The Japan Burger Championship 2026 in Yokohama next month is the ultimate battle of the beef
Mr. Sato takes a walk on Tokyo’s American-style street to get some American/Japanese ice cream
Sushi Pizza surprises diners in one of the best food destinations in Japan
Pikachu cakes and other adorable Pokémon 30th anniversary food coming to Tokyo luxury hotel
Tokyo’s life-size Gundam anime mecha statue will be removed this summer
The average age of Japan’s hikikomori shut-ins is getting older, survey shows
Ichiraku Ramen-inspired ramen sets from Naruto anime pay homage to Naruto, Sasuke, and Sakura
Kanji ice cream becomes a sell-out hit in Japan
Japan now has gyoza doughnuts, and they taste like no other doughnut we’ve tried before
Japan has a new cute and clever sunblock for cat lovers
Tokyo’s new extra-expensive ramen restaurant is dividing opinions, so we tried a bowl
Japan’s human washing machines will go on sale to general public, demos to be held in Tokyo
Starbucks Japan releases new drinkware and goods for Valentine’s Day
We deeply regret going into this tunnel on our walk in the mountains of Japan
Starbucks Japan releases new sakura goods and drinkware for cherry blossom season 2026
Japan’s newest Shinkansen has no seats…or passengers [Video]
Major Japanese hotel chain says reservations via overseas booking sites may not be valid
Put sesame oil in your coffee? Japanese maker says it’s the best way to start your day【Taste test】
No more using real katana for tourism activities, Japan’s National Police Agency says
Japan reportedly adding Japanese language skill requirement to most common foreigner work visa
Japan’s 5.3 million beautiful Hitachi Nemophila flowers are now in full bloom[Photos]
Tokyo Station’s new guidance robot is extremely terrifying, pretty helpful【Video】
Japan Railways now has giant robots performing maintenance work via VR-goggled operators
Tokyo’s fried-chicken cooking robot is here, and here’s a guide to help you use it【Photos】
Tokyo train station’s free luggage storage terminals will keep your stuff safe as you take a dump
From Tokyo to Hokkaido for under 50 bucks in train tickets–Part 2 of our Japanese rail voyage
Japan goes from capsule hotels to capsule offices with free Wi-Fi, device charging in Tokyo
Anime star Captain Tsubasa takes over Tokyo train station, turns ticket gate into soccer field